יום שלישי, 22 במרץ 2011
How Vital Is a Planet's Magnetic Field? New Debate Rises (SPACE.com)
SPACE.com - Our nearest planetary neighbors, Mars and Venus, have no oceans or lakes or rivers. Some researchers have speculated that they were blown dry by the solar wind, and that our Earth escaped this fate because its strong magnetic field deflects the wind. However, a debate has arisen over whether a magnetic field is any kind of shield at all.
